"use client";

import { memo } from "react";
import { SparklesIcon } from "./icons";

/**
 * Gemini 图片生成加载占位符组件
 * 显示一个 170x200 像素的模糊动态效果
 */
export const GeminiImageLoading = memo(() => {
  return (
    <div
      className="group/message fade-in w-full animate-in duration-300"
      data-role="assistant"
      data-testid="message-assistant-gemini-loading"
    >
      <div className="flex items-start justify-start gap-3">
        {/* 头像 */}
        <div className="relative -mt-1 flex size-8 shrink-0 items-center justify-center">
          <div className="absolute inset-0 rounded-full bg-purple-500/20 animate-ping" />
          <div className="absolute inset-0 rounded-full bg-purple-500/10 animate-pulse" />
          <div className="relative flex size-8 items-center justify-center rounded-full bg-background ring-2 ring-purple-500/30">
            <div className="animate-spin text-purple-500">
              <SparklesIcon size={14} />
            </div>
          </div>
        </div>

        <div className="flex flex-col gap-3">
          {/* 文本提示 */}
          <div className="flex items-center gap-1.5">
            <span className="text-base font-medium text-foreground">
              正在生成图片
            </span>
            <span className="flex gap-1">
              <span
                className="h-2 w-2 rounded-full bg-purple-500 animate-bounce"
                style={{ animationDelay: "0ms" }}
              />
              <span
                className="h-2 w-2 rounded-full bg-purple-500 animate-bounce"
                style={{ animationDelay: "150ms" }}
              />
              <span
                className="h-2 w-2 rounded-full bg-purple-500 animate-bounce"
                style={{ animationDelay: "300ms" }}
              />
            </span>
          </div>

          {/* 图片占位符 - 170x200 像素，带模糊动态效果 */}
          <div
            className="relative overflow-hidden rounded-xl"
            style={{ width: "170px", height: "200px" }}
          >
            {/* 底层渐变背景 */}
            <div className="absolute inset-0 bg-gradient-to-br from-purple-400 via-pink-400 to-blue-400 opacity-60" />
            
            {/* 动态模糊叠加层 1 */}
            <div 
              className="absolute inset-0 bg-gradient-to-tr from-purple-500/40 via-transparent to-pink-500/40 animate-pulse"
              style={{ animationDuration: "2s" }}
            />
            
            {/* 动态模糊叠加层 2 */}
            <div 
              className="absolute inset-0 bg-gradient-to-bl from-blue-500/30 via-transparent to-purple-500/30 animate-pulse"
              style={{ animationDuration: "2.5s", animationDelay: "0.5s" }}
            />
            
            {/* 噪点纹理效果 */}
            <div 
              className="absolute inset-0 opacity-30"
              style={{
                backgroundImage: `url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E")`,
              }}
            />
            
            {/* 模糊叠加 */}
            <div className="absolute inset-0 backdrop-blur-sm" />
            
            {/* 中心图标 */}
            <div className="absolute inset-0 flex items-center justify-center">
              <div className="relative">
                {/* 外圈光晕 */}
                <div className="absolute -inset-4 rounded-full bg-white/20 animate-ping" style={{ animationDuration: "1.5s" }} />
                {/* 图片图标 */}
                <svg
                  className="h-10 w-10 text-white/80 animate-pulse"
                  fill="none"
                  stroke="currentColor"
                  viewBox="0 0 24 24"
                  style={{ animationDuration: "1.5s" }}
                >
                  <path
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    strokeWidth={1.5}
                    d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l1.586-1.586a2 2 0 012.828 0L20 14m-6-6h.01M6 20h12a2 2 0 002-2V6a2 2 0 00-2-2H6a2 2 0 00-2 2v12a2 2 0 002 2z"
                  />
                </svg>
              </div>
            </div>
            
            {/* 流光效果 */}
            <div 
              className="absolute inset-0 bg-gradient-to-r from-transparent via-white/20 to-transparent -translate-x-full animate-shimmer"
              style={{ 
                animation: "shimmer 2s infinite",
              }}
            />
          </div>
          
          {/* 提示文字 */}
          <span className="text-xs text-muted-foreground">
            AI 正在创作中，请稍候...
          </span>
        </div>
      </div>
      
      {/* 流光动画样式 */}
      <style jsx>{`
        @keyframes shimmer {
          0% {
            transform: translateX(-100%);
          }
          100% {
            transform: translateX(100%);
          }
        }
      `}</style>
    </div>
  );
});

GeminiImageLoading.displayName = "GeminiImageLoading";